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30 results for “Benthic structure”
Data from: An in situ approach for measuring biogeochemical fluxes in structurally complex benthic communities
1. The exchange of energy and nutrients are integral components of ecological functions of benthic shallow-water ecosystems and are directly dependent on in situ environmental conditions. Traditional laboratory experiments cannot account for the multidimensionality of interacting processes when assessing metabolic rates and biogeochemical fluxes of structurally complex benthic communities. Current in situ chamber systems are expensive, limited in their functionality, and the deployment is often restricted to planar habitats (e.g., sediments or seagrass meadows) only. 2. To overcome these constraints, we describe a protocol to build and use non-invasive, cost-effective, and easy to handle in situ incubation chambers that provide reproducible measurements of biogeochemical processes in simple and structurally complex benthic shallow-water communities. Photogrammetry tools account for the structural complexity of benthic communities, enabling to calculate accurate community fluxes. We tested the performance of the system in laboratory assays and various benthic habitats (i.e., algae growing on rock, coral assemblages, sediments, and seagrass meadows). In addition, we estimated community budgets of photosynthesis and respiration by corals, rock with algae, and carbonate sediments, which were subsequently compared to budgets extrapolated from conventional ex situ single-organism incubations. 3. The tests highlight the transparency (> 90% light transmission) of the chambers and minimal water exchange with the surrounding medium on most substrates. Linear dissolved oxygen fluxes in dependence to incubation time showed sufficient mixing of the water by circulation pumps and no organismal stress response. The comparison to single-organism incubations showed that ex situ measurements might overestimate community-wide net primary production and underestimate respiration and gross photosynthesis by 20 – 90%. 4. The proposed protocol overcomes the paucity of observational and manipulative studies that can be performed in in situ native habitats, thus producing widely-applicable and realistic assessments on the community level. Importantly, the tool provides a standardized approach to compare community functions across a wide range of benthic habitats. We identify multiple experimental strategies, including the manipulation of stressors/factors, and discuss how the method may be implemented in a variety of aquatic studies.
Data from: RAD sequencing resolves fine-scale population structure in a benthic invertebrate: implications for understanding phenotypic plasticity
The field of molecular ecology is transitioning from the use of small panels of classical genetic markers such as microsatellites to much larger panels of single nucleotide polymorphisms (SNPs) generated by approaches like RAD sequencing. However, few empirical studies have directly compared the ability of these methods to resolve population structure. This could have implications for understanding phenotypic plasticity, as many previous studies of natural populations may have lacked the power to detect genetic differences, especially over micro-geographic scales. We therefore compared the ability of microsatellites and RAD sequencing to resolve fine-scale population structure in a commercially important benthic invertebrate by genotyping great scallops (Pecten maximus) from nine populations around Northern Ireland at 13 microsatellites and 10 539 SNPs. The shells were then subjected to morphometric and colour analysis in order to compare patterns of phenotypic and genetic variation. We found that RAD sequencing was superior at resolving population structure, yielding higher Fst values and support for two distinct genetic clusters, whereas only one cluster could be detected in a Bayesian analysis of the microsatellite dataset. Furthermore, appreciable phenotypic variation was observed in size-independent shell shape and coloration, including among localities that could not be distinguished from one another genetically, providing support for the notion that these traits are phenotypically plastic. Taken together, our results suggest that RAD sequencing is a powerful approach for studying population structure and phenotypic plasticity in natural populations.
Data from: Influence of abiotic and biotic factors on benthic marine community composition, structure and stability: a multidisciplinary approach to molluscan assemblages from the Miocene of northern Germany
<p><span>The Miocene mica-clay deposits of Groß Pampau (northern Germany) are well known for their diverse assemblages of marine mammals, particularly whales. Despite numerous systematic and biostratigraphic studies, an in-depth palaeoecological analysis of its diverse molluscan assemblages and a comprehensive palaeoenvironmental reconstruction are lacking. Here, we integrated new faunal, sedimentological, and geochemical data to reconstruct the marine palaeo-ecosystem of the late Miocene sedimentary succession of Groß Pampau, and to identify the drivers controlling the composition, ecological structure and temporal dynamics of its macrobenthic molluscan assemblages. Fossil evidence, coupled with analyses of clay mineral composition, grain size distribution, and geochemical data (total organic carbon, total nitrogen, δ<sup>13</sup>C, δ<sup>18</sup>O, δ<sup>15</sup>N of sediment and shells), suggest a warm-temperate, mesotrophic, low-energy, offshore marine setting mostly below storm wave base and a pronounced surface-to-bottom water temperature gradient. Low variability in sedimentological and geochemical signals indicates generally stable physico-chemical conditions, whereas occurrences of opportunistic species (<em>Varicorbula</em> <em>gibba</em>) point at </span><span>occasionally less favourable bottom conditions, possibly related to transient hypoxia</span><span>. Canonical correspondence analysis reveals that the distribution of molluscan assemblages correlates with total organic carbon and nitrogen content, suggesting organic matter availability at the seafloor as a controlling factor. A pattern of repetitive punctuated stasis of molluscan assemblages is defined by the temporal persistence in taxonomic and ecological composition, occasionally interrupted by shifts to a different faunal configuration. We suggest that both stable environmental conditions and biotic interactions, i.e. the top-down control exerted by carnivorous gastropods and environmental modification by ubiquitous burrowing deposit feeders, probably contributed to the observed temporal stability. Whereas comparison with Miocene molluscan assemblages of Gram, Denmark, revealed differences in the presence and relative abundance of genera, functional congruence indicates that offshore benthic ecosystems of the southern North Sea Basin functioned similarly.</span></p>
Data from: The structure and distribution of benthic communities on a shallow seamount (Cobb Seamount, Northeast Pacific Ocean)
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Data from: Influence of abiotic and biotic factors on benthic marine community composition, structure and stability: a multidisciplinary approach to molluscan assemblages from the Miocene of northern Germany
Open the record for dataset details and reuse information.
Data from: An in situ approach for measuring biogeochemical fluxes in structurally complex benthic communities
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Data from: RAD sequencing resolves fine-scale population structure in a benthic invertebrate: implications for understanding phenotypic plasticity
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Linked collectors and determiners for: Checklist of pioneer benthic taxa found on Autonomous Reef Monitoring Structures (ARMS) in Terra Nova Bay (Ross Sea, Antarctica).
Natural history specimen data linked to collectors and determiners held within, "Checklist of pioneer benthic taxa found on Autonomous Reef Monitoring Structures (ARMS) in Terra Nova Bay (Ross Sea, Antarctica)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/f024a3d3-7bb2-4985-be57-d890936769ff">https://bionomia.net/dataset/f024a3d3-7bb2-4985-be57-d890936769ff</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/f024a3d3-7bb2-4985-be57-d890936769ff">https://gbif.org/dataset/f024a3d3-7bb2-4985-be57-d890936769ff</a>. Formatted as a Frictionless Data package.
Figure 1 in Comparison of trophic structure of the benthic macroinvertebrates in three Bulgarian riverine water bodies
Figure 1. Location of studied points of the Mesta, Tundzha, and Vit Rivers.
Abundance of benthic sessile fauna associated with ARMS from the research" Evaluation of the use of Autonomous Reef Monitoring Structures (ARMS) for capturing the biological diversity of two coral reefs in the Yucatán Península, México " using the point intersection method (400 points per plate on each side) with the CPCe v4.1 soft-ware (Coral Point Count with Excel extension v4.1)
<p><strong>*Corresponding autor: </strong>edlinguerra@gmail.com</p> <p>This database contains information on the abundance of benthic sessile fauna associated with ARMS from the research “Evaluation of the use of Autonomous Reef Monitoring Structures (ARMS) to estimate cryptic diversity in two coral reefs of the Yucatan Península, México” using the point intersection method (400 points per plate on each side) with the CPCe v4.1 soft-ware (Coral Point Count with Excel extension v4.1) to analyze </p> <p>Krebs, C.J. Estimating Density: Quadrats Counts. In <em>Ecological Methodology</em>; Addison-Wesley Educational Publishers, Inc., 1999; p. 69 ISBN 0321021738</p> <p>Kohler, K.; Gill, S. Coral Point Count with Excel extensions (CPCe): A Visual Basic program for the determination of coral and substrate coverage using random point count methodology. <em>Comput. Geosci.</em> <strong>2006</strong>, <em>32</em>, 1259–1269</p> <div> <p><span lang="EN-US">was produced in collaboration with the Biodiversidad Marina de Yucatán project. </span><a href="https://www.bdmy.org.mx/carteles-publicaciones/" target="_blank" rel="noopener">https://www.bdmy.org.mx/,</a> Universidad Nacional Autonoma de México, Harte Research Institute for Gulf of Mexico Studies and Escuela Nacional de Estudios Superiores</p> </div>
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